Electric-field Resonance Coupling between Human and Transmitter for Human Position Estimation System

Sousuke Nakamura,Shimon Ajisaka,Kiyoaki Takiguchi,Akira Hirose,Hideki Hashimoto 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10

In this paper, a novel human position estimation system using electric-field resonance coupling is proposed. There are various advantages of using electric-field for human position estimation system. The system is robust to illumination change, body-worn tags are not required and sensors could be hidden since electric-field can path through an insulator. Tags are not required because the system estimates the position by measuring the electric field transmitted along the human body which acts as an electric-field coupler. Moreover, the proposed system has wider sensing range and higher expandability to position estimation of multiple humans compared to the current system. Unlike the current system which only measures the electric-field coupled between human and transmitter, the proposed system measures the electric-field amplified by the resonance occurring inside the human (equivalent to giant antenna) to achieve wider sensing range. Meanwhile, the proposed system is also designed carefully to maintain the expandability to multiple humans position estimation. Based on the simulation results, it is verified that the sensing range could be up to 50[cm] with less than 5[cm] error. In the future, the proposed system could be a powerful alternative for the current system.

A Shared Channel Design for the Power and Signal Transfers of Electric-field Coupled Power Transfer Systems

Su, Yu-Gang,Zhou, Wei,Hu, Aiguo Patrick,Tang, Chun-Sen,Hua, Rong The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2

Electric-field coupled power transfer (ECPT) systems have been proposed as an alternative wireless power transfer (WPT) technology in recent years. With the use of capacitive plates as a coupling structure, ECPT systems have many advantages such as design flexibility, reduced volume of the coupling structure and metal penetration ability. In addition, wireless communications are effective solutions to improve the safety and controllability of ECPT systems. This paper proposes a power and signal shared channel for electric-field coupled power transfer systems. The shared channel includes two similar electrical circuits with a band pass filter and a signal detection resistor in each. This is designed based on the traditional current-fed push-pull topology. An analysis of the mutual interference between the power and signal transmission, the channel power and signal attenuations, and the dynamic characteristic of the signal channel are conducted to determine the values for the electrical components of the proposed shared channel. Experimental results show that the designed channel can transfer over 100W of output power and data with a data rate from 300bps to 120 kbps.

A Shared Channel Design for the Power and Signal Transfers of Electric-field Coupled Power Transfer Systems

Yu-Gang Su,Wei Zhou,Aiguo Patrick Hu,Chun-Sen Tang,Rong Hua 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2

Electric-field coupled power transfer (ECPT) systems have been proposed as an alternative wireless power transfer (WPT) technology in recent years. With the use of capacitive plates as a coupling structure, ECPT systems have many advantages such as design flexibility, reduced volume of the coupling structure and metal penetration ability. In addition, wireless communications are effective solutions to improve the safety and controllability of ECPT systems. This paper proposes a power and signal shared channel for electric-field coupled power transfer systems. The shared channel includes two similar electrical circuits with a band pass filter and a signal detection resistor in each. This is designed based on the traditional current-fed push-pull topology. An analysis of the mutual interference between the power and signal transmission, the channel power and signal attenuations, and the dynamic characteristic of the signal channel are conducted to determine the values for the electrical components of the proposed shared channel. Experimental results show that the designed channel can transfer over 100W of output power and data with a data rate from 300bps to 120 kbps.

Influence of Electric Upsetting Process Variables on Temperature Field Evolution by Multi-Field Coupling Finite Element Analysis

Quan Guozheng,Luo Guichang,Wen Hairong 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.

Electric upsetting is a complex electrical-thermal-mechanical multi-field coupling technology to the manufacturing process of exhaust valves. Generally, it is difficult to obtain the appropriate forming parameters in the practical industrial production. Thus, finding a convenient and reliable way to choose the optimum process conditions for electric upsetting is a non-trivial issue that still needs to be addressed in greater depth. Based on the multi-field coupling solver platform, MSC.Marc, a finite element model of electric upsetting was established, and then the influence of current and upsetting pressure on deformation were analyzed. It is concluded that as current increases, the maximum temperature and diameter of the deformed material increases, meanwhile as upsetting pressure increases, the maximum temperature decreases, but the maximum diameter of the onion-shape increases. In addition, by means of a three-stage load mode of direct current, the secondary upsetting defect has been avoided. Finally, the finite element model was validated by the results of physical experiments.

Magnetic Field Analysis of Wireless Power Transfer via Magnetic Resonant Coupling or Electric Vehicle

Kesamaru, Katsumi Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.1

This paper describes the magnetic field analysis of wireless power transfer via magnetic resonant coupling. The wireless power transfer system for supplying power to electric vehicle is developed. The parameters of coil transfer system are simulated by the finite element method (FEM). Therefore the coil structure of power transfer system can be accurately analyzed. This paper deals with 3kW wireless transfer system.

An Electric-Field Coupled Power Transfer System with a Double-sided LC Network

Xie, Shi-Yun,Su, Yu-Gang,Zhou, Wei,Zhao, Yu-Ming,Dai, Xin The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.1

Electric-field coupled power transfer (ECPT) systems employ a high frequency electric field as an energy medium to transfer power wirelessly. Existing ECPT systems have made great progress in terms of increasing the transfer distance. However, the topologies of these systems are complex, and the transfer characteristics are very sensitive to variations in the circuit parameters. This paper proposes an ECPT system with a double-sided LC network, which employs a parallel LC network on the primary side and a series LC network on the secondary side. With the same transfer distance and output power, the proposed system is simpler and less sensitive than existing systems. The expression of the optimal driving voltage for the coupling structure and the characteristics of the LC networks are also analyzed, including the transfer efficiency, parameter sensitivity and total harmonic distortion. Then, a design method for the system parameters is provided according to these characteristics. Simulations and experiments have been carried out to verify the system properties and the design method.

3개의 유전체 구형 도파로에서 간섭과 coupling

김영태 김천대학교 2009 김천대학교 논문집 Vol.30 No.-

Coupled-mode equations for three identical dielectric rectangular waveguides with separation distances s have been derived by using quasi TE and TM modes where no spurious modes appear. The propagation constants are found as a function of the separation s. Comparisons with the coupled-mode theory, the well-known perturbation analysis, and other numerical methods, for example, FDM or FEM demonstrate very good agreement. The coupled-mode equations may be applied to the modeling and analysis of propagation and coupling in practical optical waveguide devices.

Analysis of Coupled-Inductor Configuration for an Interleaved High Step-Up Converter

Wilmar Martinez,Jun Imaoka,Yuki Itoh,Masayoshi Yamamoto,Kazuhiro Umetani 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6

High step-up converters are widely used in sustainable energy systems and recently used in automotive applications due to their high voltage gain capability. Nevertheless, with the purpose of obtaining a higher voltage gain, in comparison with conventional boost converters, current high step-up converters often employ additional multiplier cells, which may lead to significant cost-up and low power density. Therefore, a novel two-phase interleaved high step-up converter is proposed in order to minimize additional circuit volume used to achieve large voltage gain. The proposed converter addresses the purpose by a particular coupled inductor where three windings are installed in one or two cores. As a result, the proposed converter can achieve higher voltage gain than the conventional topologies by adding a winding and two diodes to the interleaved two phase boost chopper, besides the coupled-inductor configuration. This paper evaluates two arrangements of the coupled-inductor configuration of the proposed high step-up converter: 1. Three windings integrated in only one core and 2. Two independent inductors with a shared winding. The result revealed that the proposed converter shows higher voltage gain than the normal boost converter and the magnetic integration in the coupled-inductor configuration further increases the voltage gain by 20%.

Coupling 반응에 의한 파라-메타 페닐렌 공중합물의 전기적 특성 및 열 안정성에 관한 연구

김대흠 광운대학교 신기술연구소 1998 신기술연구소논문집 Vol.27 No.-

파라페닐렌과 메타폐닐렌의 공중합물을 조성의 변화를 두어 공중합시켜서 패닐렌공중합물을 생성하였고 이 생성된 공중합물의 전기적. 열 안정성을 측정하였다. 생성된 공중합물은 2000 - 5000 사이의 분자량을 나타내었고. THF 등의 유기용매에 용해되는 현상을 보였다. 공중합물은 FeC1_3에 의해 도우핑되었으며 이때의 전기전도도는 베타함량이 20%에 도달할 때까지 급격히 감소하였으며 그이후 완만한 감소를 보였다. 열안정성을 10%감량온도로 측정한 결과 400℃ 전후의 높은 안정성을 보였다. Paraphenylene and metaphenylene were copolymerized and the electrical properties and the thermal stabilities of the synthesized copolymers were examined. The molecular weights of the synthesized copolymers were in the range of 2000 - 5000. and the copolymers were dissolved in several organic solvents. The copolymers were doped with FeCl_3 and the electrical conductivities. of the copolymers were decreased fast up to 20% meta contents. and afterwards, the decrease was very mild. Thermal stabilities were measured by 10% weight loss temperatures and they are on and above 400℃, which were very stable.

ELECTRICAL TRANSPORT PROPERTIES OF SINGLE-WALLED CARBON NANOTUBE BUNDLES TREATED WITH BORIC ACID

DALE HITCHCOCK,KEQIN YANG,JIAN HE,APPARAO M. RAO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.4

Electric-arc-synthesized single-walled carbon nanotube (SWNT) bundles were sonicated in boric acid, dried and sintered under vacuum at 1200°C using a spark plasma sintering process. The nominal boric acid concentrations were 0%, 2.5%, 5%, 7.5%, 12.5% and 15%. This resulted in a nonmonotonic variation of carrier concentration in the resulting samples. The 7.5% boric acid treated sample showed the least magnitude and weakest temperature-dependence for the thermopower with a distinct phonon-drag peak that was absent in the other samples. These results are discussed within the framework of the doping-induced shift of the Fermi level and changes in the electron–phonon coupling.